Ptolemaic chariots were mentioned only once by Appian, while he was describing a battle which occured 300 hundred ages before him!
Furthermore, the fact that he claims that the Egyptians had a 350.000 men army, with an other 300.000 as reserves, undermines effectively his unreliable comments.
Finally, Polybius' account for the above mentioned battle, only 40 years after, contains many more details (visit my latest post), while he doesn't refer to chariots at all.
Anyway, even if the Egyptians had chariots (highly unlikely), they wouldn't be the depicted ones (Ramesete style of 1200 AD), but the scythed ones:
The reason is that:
1) These chariots were the only ones used in Middle East during this age.
2) The last mention of Ramesete chariots was 1000 years before the game starts.
3) They were handled by Egyptians, who, under the Ptolemaic regime, were a minor portion of their army.
4) No scythed chariots were obsolete, because of the cavalry, which was much more flexible and lethal.
5) The Ramesete scythed chariot never existed.
There is nothing more to be said.